Rivet.



No. 862,434. vPATBNTED AUG. 6, 1907.

' W. P. BAR'TBL.

RIVET.

APPLICATION FILED JAN. 5, 1907.

, the following is a specification.

UNITE f VILLIAM P. BAR-TEL,

OF WALTHAM, MASSACHUSETTS, A'SSIGNOR TO ,TU'BSON MFG COMPANY, A CORPORATION OF MAINE.

stares PATENT OFFICE.-

RIvET.

Application filed ilenuary 5,1907. Serial No. 350,871.

To all whom 'it may concern: l

Be it known that I, WILLIAM P. BARTEL, a citizen of the United States, residing at Waltham, in the county ofl Middlesex and State of Massachusetts, have invented new and useful Improvements in Rivets, of which This invention relates to atwo-part rivet, which is particularly adapted to be used in connection with the tires of vehicles, Such as automobiles.

The object of the invention is to provide `a rivet which can be easily and strongly fastened to a piece of leather, rubber, or the like, constituting a portion of the tire of a vehicle, so that the same will project be* yond the tread of the tire and preventthe wheel from slipping circumferentially" or from slipping sidewise or skidding, so-called, upon slippery or icy surfaces.

The invention consists in a two-part rivet formed and constructed as set yforth in the following specification and particularly as pointed out in the claims thereof.

Referring to the drawings: Figure '1 is a plan View of a rivet shank partly formed in accorda-nce with my invention. Fig. 2 is a section taken on line 2'-2 of Fig. 1. Fig. 3 is a plan vi e`W of a rivet shank formed to receive a piece of hardened metal constituting' the head, with said piece of hardened metal located in a recess formed in the upper face of the flange. Fig. Il is a sectional elevation taken on line4-4 of Figf.

v Fig. 5 is a plan view of 'the completed rivet. Fig. 6

is a section taken on line 6 6 of Fig. 5.` Fig. 7 is a plan view of a modified form of rivet. Fig. 8 is a sec-l tion taken online BTS-of Fig. 7.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings Figs. l and 2 show a rivet, withv a ,flat head, which, when completely formed, constitutes the shank 10 to which the hardened piece of metal forming the headis affixed, as hereinafter described. The shank 10 has aange 1l preferably integral therewith, the outer portion 12' of said flange, that is the portion adjacent to the periphery thereof, being thicker than .that portion adjacent to the stem 13..

In Figs. 4 and 5 thesha-nk is illustrated with the outer portion 12 bent upwardly to form a rim which incloses a recess 14 in which the hardened piece of metal constituting the head 15 is placed, as illustrated in Fig. 4. The head 1.5 has a conical base -16 and when` the rivet is finally completed, as illustrated in Figs. 5 and 6, the rim 12 is forced into a cylindrical hole formed in a suitable female die, thus elosingsaidrirn u'p'theV conical base 16 and locking the head 15 to the shankj 1 0, as clearly shown vin'` Fig'f'The head 15'has pyramidal projections 17 upon the'mp thereof which Specification of Letters-, Patent.

are separated from each other -by intersecting grooves I8,l 19. A i The sides of the grooves 1.8

formed'upon an angle to the top of the base 16 and the outer edge of said head is also formed pon an angle, thus resultingin four pyramidal projections 17, 17 17, 17 terminating in points 22, 22 with cutting edges 2 1, 2l

and 19 are preferably 5S extending from said points downwardly toward the ,base of the head 1.5.

It will'be noted that in its final and completed form the rirn or outer periphery of the flange 11 is cylindrical, while the recess 14 becomes truste-conical, this formation being obtained, as hereinbefore set forth, by fore# 6 5 of the tire ofthe vehicle,either to a piece oi leather or 75 rubber or any suitable material which may be attached to or vulcanized upon an automobiletire. Itis evident that the projecting points or projections 1 7, 17 will cut into ice in slippery weather and will also prevent the wheels from skidding or slipping c ircumferen'tially 80 thereof upon any surface.

The hardened piece of metal forming tl'e lhead adds very much to the wearing qualities of the rivet and even after the projections 17 become worn, said rivet will perform the function of preventing the tire from. 8,5:

slipping, although to a less degree than in the case where the projections are sharp.

The forrnof the projections 17 may be varied without departing fromy the spirit of my invention and in Figs.

7 and 8 a variation inthe form ol' said'projeetions is llus- 90 trated, the remainder of the rivet being substantially the saine as that illustrated in Figs. 5 and G, hereinbel'ore described. ...n

ln Figs. 7 and 8 the headvl is not beveled upon i154,

outer upper edge as in thev form illustrated in Fig. (i,

but haslstraiglit sides, so that the grooves I8 and I9 intersect/ ton-form cutting edges .2l/, 2l -\\'hieli'(xleml' downwardly from the? points 22 to the base 1(3 of the head. The base 16 in this form of my invention is frusto-conical and fits into a corresponding recess in the lflangell/ of theY shank 10i-.- Y Having thus deseribedmy invention, wlmtl claim '-and desirerbyLetters Pat t to 'secureis;

rj anfang u'siiunk, smasimm; i

having wcylindrical Hang'epilvided with a frusto-crmicai re'cess in its upper face, said head having :i conical base fitting,r into said recess and having a plurality of projections thereon. in testimony wlireof I' have lieieul'to svt my iiunki iii l re @ss iii its upper fame, Suid head forium] vi0 lit in Suid re- 2. A rivet comprisinf :1 head and n shank, sind shank ircsoum: if lfwn suliSri-ilimg; wiinissi-s.

having ai cylindrical flange integral thormrilli and provided WILLIAM I. {Allllllh ywith a recess in its upper falce. slnd lionil located in gaia l'cess sind formed to interlock with the sidra Valls' thereof.

3. Arivct cniprllelm,Y :i lieirl und a shank, sind shank 

